Variable locations of nutrient foramina of the proximal phalanx in forelimbs of standardbreds.

This research studies the locations of the nutrient foramina in the proximal phalanx (first bone of the finger or toe) of standardbred horses, and their occurrence and difference in each forelimb. The researchers used radiographs for this examination and found that the foramina locations were not consistent across both forelimbs and neither could their locations be determined by the horse’s age or sex.

Methodology

• The researchers conducted a radiographic examination of the forelimbs of 100 standardbred horses, specifically looking at their proximal phalanges (the first bones in the digits of the horses’ forelimbs).
• The scientists were specifically interested in visualizing and determining the precise location of the nutrient foramina — small holes in the bone that allow blood vessels to pass through to nourish the bone and its marrow.

Findings

• Of the 100 horses studied, 45 had nutrient foramina in the same location on the proximal phalange of both forelimbs (bilateral symmetry).
• In the remaining 55 horses, the nutrient foramina of the left and right proximal phalanges were not in the same location (asymmetry).
• Out of a total of 200 proximal phalanges inspected (two for each of the 100 horses), 78 had nutrient foramina located in the dorsal cortex (rear side), 61 had the foramina in the palmar cortex (front side), and 61 had no foramina that could be detected with a radiographic scan.

Conclusion

• Statistical analysis of the observations did not show any significant correlation (P=0.05) between the foramina location and the age or sex of the horses. This suggests that these variables don’t noticeably influence the formation and location of nutrient foramina in the proximal phalanges of standardbred horses.
• Therefore, it can be concluded that the locating nutrient foramina in the proximal phalanges in standardbred horses show natural variability and are not necessarily symmetric in both limbs, nor consistent across the population.